Canister



Jan. 13, 193 1. MQNRQ ETAL 1,789,262

. CANISTER,

Filed March 15, 1928 INVENTORJIM F47 I RandoZ/Vmro y John C. COS/L07)! Sum -PW A TTORNEY5.

Patented Jan. 13, 19 31 i i v UNITED STATES PATENTJ omen RANDOLPH MONRO AND JOHN C. GOSHORN, F EDGEWOOD, MARYLAND cemsrnn I Application filed March 15,1928. Serial No. 261,965.

(GRANTED UNDER THE ACT OF MARCH 3, 1883, AS AMENDED APRIL 30, 1928; 370 0. G. 757),

The invention described herein may be to provide a canister for respiratory apparamanufactured and used by or for the Govtus having provision for preventing the ernment for government purposes, without chemlcals from interfering with the operathe payment to us of any royalty thereon. tion of the intake and outlet mechanisms.

This invention relates in general to respira- Yet a still further object of this invention tory apparatus, and more particularly has 1 0 provldea canister for respiratory ap reference to an improved canister for gas Paretlls h vmg pr visions for uniformly k compressing the contents and preventing Previous to this time the masks employed geof t C micals; v v

10 in warfare and industry for protection Th1S 1I1V8ntl011 CODSiStS in general of the against toxic and noxious gases or smokes P 1 11 of a panisterfor respiratory appa-- have had embodied in their structure certain mp i g a casing ing a tapered fundamental disadvantages, generally centop portion and a threaded neck joined on tering around the canister element that this h p P apt d o engage the 15 i ti seeks t Overcome, threaded recess in the valve. The neck is 05 The canisters used prior to this time have PrOVlded h n integral overlapping not been suitably protected against moisture flange designed to serve the double purpose reaching the contents, either in use or in of reinforcing the structure and acting as a storage, nor has there been provided adequate seat 1601' a sleeve adapted tQ receive an out shield in their structure to prevent clogging l Check V v T e bo tom of thecanister or damaging the intake and outlet valves. 13 provl ed with an aperture having edges The valves customarily used in such canisters l g a Seat t0 receive a Sleeve for an inhave been fixed and in case of defect or for take heck valve. other purposes it has been impossible to [T e b ttom of t e contain r is pr id d 25 easily interchange them. The casings have w th a v cal circu ferent al flange adapt: furthermore been of unstable structure, offered to be telescoped in the casing of the ing littleresistance against bending and e en A dome of irregularshape afiordthereby liable to functioninefliciently when lng equal contact against the edge of the distortedor. being rendered totally inoperacanister bottom is simultaneously held under tive when strained to the point of rupture, maximum compression throughout its entire There has been no provision in the prior periphery to insure a positive step to prevent art for compressing the chemicals within the. collapse of the chemicals against the lower canister to insure greater efliciency of operacheck valve. A circumferential flange is protion, nor have the canisters had partitions of vided in the vertically extending portion of 35 sufiicient strength provided between the the bottom to act as a retainer for the edges stratas of chemicals to insure the stable poslof the dome. w n tion of the contents without retarding the With these and other objects in view which normal operation. i may be incident to the improvements, the- An object of this invention is to provide invention consists in the parts and combina- 40 a' canister for respiratory apparatus having tions to be hereinafter set forth and claimed, provisions for preventing moisture reaching with the understanding that the several necthe contents in operation or during storage. essary elements comprising the invention,

Another object of this invention is to promay be varied in construction, proportions vide a canister for respiratory apparatus havand arrangement, without departing from ing removable intake and outlet mechanisms. the spirit and scope of the appended claims.

-A further object of this invention is to In order to make the invention more clearprovide a canister for respiratory apparatus 1y understood, there is shown in the accomaving provisions for insuring a rigid strucpanying drawings means for carrying the ture. same into practical efiect, Without limiting A. still further object of this invention is the improvements in'their useful applica= "7 wherein the same elements are designatedby the same numerals throughout, and more particularly to Fig. 1, there is shown a conventional gas mask, having a usual front portion composed of any suitable substance 1, eye pieces 2, made of glass, or any de-. sirable transparent composition, head straps 3, a centering band 4 for the straps 3, and

a back portion 5, joinedor continuous with.

the front rial.

Secured to the front portion 1 and the back 5, is a respiratory valve 6. The valve 6 is provided with a peripheral channel 10 adapted to afford a' leak-proofconnection, and the joint secured by" a tape 14 treated portion 1 and made of like mate- 'with adhesive substance, as shown in Fig.

2. The valve 6 comprises a threaded recess 7 integral deflector tubes 8 and a valve stem 9'adapted to receive a flutter valve 11. The fluttervalve 11 is firmly fitted in the stem 9 and the jointmade leak-proof by tape 12 h treated with adhesive substance.

The canister forming the subject matter of this invention comprises a casing having a cylindrical body portion 15 and a tapered top portion 16. Mounted on the tapered top portion 16 is a neck portion 31.

The threaded neck 31 is adapted to engage the threadedaperture 7 in the respiratory valve 6, and is provided with an overlapping circumferential flange 32 designed to lend rigidity to the structure. The canister is provided with'a bottom portion 34 having a central aperture in which there is seateda sleeve 35. The bottom portion 34 is provided with a vertical circumferential flange '36, adapted to be telescoped in the .body portion 15. A circumferential sleeve 35 is formed on the inside of the vertical flange 36. The sleeve 35 is adapted to re;

' ceive a rubber intake check valve 37 and a check valve flap 38. A cap 39- havingperforations to admit the contaminated air is adapted tocbe fitted in a snap channel 40 provided in the valve sleeve 35. f

A sleeve 41 is adaptedto be seated on the flange 32 on the neck portion 31. The sleeve 41 is designed to receive an outlet rubber check valve 42 having a flap 43.

The canister is loaded at the bottom with a layer of caustic pumice 18 resting on a dome retainer 19. The dome retainer 19 is adapted to contactagainst the edge of the botton1 34 and be held 'by the angle member 33. A screen partition 20 is fitted to the canister casing 15 over the pumice, and superimposed on the screen disk is a non-inflammable cloth disk 21. A strata of activated charcoal 22 is placed on the cloth 21 and over the activated charcoal is provided a filtering partition attached to the casing wall 15 comprising a screen disk 23 and a sheet of filtering mate rial 24. Resting on the filtering material 24 is a strata of hopcalite 25. Over the surface of the hopcalite there is a fireproof cloth portion 26, upon which there is superimposed a screen portion-27 attached to the canister wall 15, and a fireproof cloth 28 superimposed over the screens 27. Acollar 29 having a shoulder 30 is designed to fit on the cloth 28, the shoulder 30 being adapted to engage the flange32 on the neck 31.

gasket 44 is adapted to. be interposed between theflange 32 of the canister andthe respiratory valve 6 when the. flange isfin engagement with the threaded recess on the valve. Awire 45 is riveted on the gasket 44 across the inlet to prevent the flap 43 from entering the orifice in the tubes 8 during inhalation. i Y r The operation of this invention may be readily understood having reference to Figs. 2 and 3. The tubes 8 are adapted to deflect the inhaled air over the eye pieces 2. The wire 45 riveted on the gasket 44 is so placed to prevent the flap 43 on the outlet check valve 42 of the canister from entering the orifice age of the chemicals. The collar 29 in conjunction with the integral shoulder 30 is designed to prevent the contents from clogging the outlet check valve.

The'chemica-ls shown as embodied in the container have been found in practice to have the most efficient action When incorporated in the following proportions Caustic pumice 100 c. c.

Charcoal 'i 900.0. 1

Hopcalite 130 c. c.

It is to be distinctlyunderstood that thisinvention is not limited to thechemlcals shown or the proportions named as theyai'e illustrated solely as an example, and neither is the invention restricted to any particular number of stratas of chemicals, or parti tions, or the materials of which the partitions are composed, for it is obvious that canisters are loaded to suit particular requirements and'in fact is one of the primary advantages of this invention that the canister may be loaded with the greatest ease and rapidity. l

The canister is protected against moisture reaching the contents either during use or .in storage by the rubber intake and outlet mechanism protected 'from clogging. by the contents. The intake and outlet mechanism are placed in the canister to allow ready removal for inspection or substitution. The body of the canister is made rigid by integral supports and is 1 provided with a telescopic bottom to allow compression of the contents.

While we have shown and described the preferred embodiment of the invention, it is to be understood that we do not confine ourselves to the precise details of "construction herein set forth, by way of illustration, as it is apparent that many changes and variations may be made therein, by those skilled in the art, without departing from the spirit of the invention, or exceeding the scope of the appended claims.

We claim:

1. In a canister for a respiratory apparatus, a casing having a body portion, a bottom portion, a top having a reinforced neck adapted to engage a member on the respiratory apparatus, and means carried by the 'neck'to support a check valve mechanism.

2. In a canister for a respiratory apparatus, a casing having a body portion, a bottom adapted to seat a check valve, a top having a reinforced neck adapted to engage a member on the respiratory apparatus and a sleeve 7 mounted on the neck to support a check valve 7 mechanism.

. ecting against the reinforcing flange to pretures.

3. In a canister for a respiratory apparatus, a casing, a neck having a reinforcing flange mounted on the casing, means-on the neck to support a check valve, and means provent clogging of the check valve.

4, In a canister for a respiratory apparatus, a unitary lower end structure comprising a bottom portion formed with a vertical circumferential flange, a dome retainer adapted to contact with the edge of the bottom portion, and an angle member adapted to fit within said flangeand secure said dome retainer. to said bottom portion.

In testimony whereof we aflix our signa- RANDOLPH MONRO. JOHN C. GOSHORN. 

